Electric device having first and second electric elements

An electric device comprising:

• first and second electric elements, wherein electric power consumption of the first electric element is larger than that of the second electric element, and wherein an operation temperature limit of the first electric element is higher than that of the second electric element;
• a substrate, on which the first and second electric elements are disposed;
• a casing that accommodates the substrate with the first and second electric elements;
• and
• a cooling fan disposed in the casing, wherein
• the substrate is made of a rigid flexible board,
• the substrate includes first and second rigid portions and a flexible portion,
• the first electric element is disposed on the first rigid portion, and the second electric element is disposed on the second rigid portion opposite to the first electric element, so that the first rigid portion is located between the first and second electric elements,
• the flexible portion connects the first and second rigid portions,
• the flexible portion has a thickness, which is smaller than the first and second rigid portions,
• the flexible portion further includes a wiring,
• the first and second electric elements are electrically coupled with the wiring so that high speed communication is performed between the first and second electric elements,
• the casing includes a suction opening,
• the suction opening introduces the air into an inside of the casing,
• the cooling fan blows the air toward an outside of the casing so that the first rigid portion is cooled,
• the air flows from the suction opening to the cooling fan through the inside of the casing so that an air flow direction in the casing is parallel to the substrate,
• the first rigid portion is disposed over the second rigid portion so that the first rigid portion is spaced apart from the second rigid portion,
• the first rigid portion is parallel to the second rigid portion, and
• the flexible portion is curved.